831087157 has 4 divisors (see below), whose sum is σ = 845173440. Its totient is φ = 817000876.

The previous prime is 831087137. The next prime is 831087161. The reversal of 831087157 is 751780138.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 751780138 = 2 ⋅375890069.

It is a cyclic number.

It is not a de Polignac number, because 831087157 - 2²³ = 822698549 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (831087107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7043053 + ... + 7043170.

It is an arithmetic number, because the mean of its divisors is an integer number (211293360).

Almost surely, 2^831087157 is an apocalyptic number.

It is an amenable number.

831087157 is a deficient number, since it is larger than the sum of its proper divisors (14086283).

831087157 is a wasteful number, since it uses less digits than its factorization.

831087157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14086282.

The product of its (nonzero) digits is 47040, while the sum is 40.

The square root of 831087157 is about 28828.5822925790. The cubic root of 831087157 is about 940.1897749480.

The spelling of 831087157 in words is "eight hundred thirty-one million, eighty-seven thousand, one hundred fifty-seven".